Why mail-order beats the local sign shop
A USDOT kit is the most commoditized job a sign shop does. The legal sizing is fixed, the file is the same number plus your carrier name, and the install is two pieces of vinyl per truck. Local shops still charge $200-$400 because they have to roll a truck to your yard, schedule installers, and amortize a $30K printer across whatever else they're running that week.
We do nothing but kits. The plotter runs from 7 a.m., the weeders and pre-mask team work in batches, and orders go out as USPS or UPS Ground flat-rate boxes every Thursday. Your kit lands Friday or Saturday in most of the country, ready for you or your driver to apply with a squeegee and a wipe.